2000 TOYOTA 4RUNNER Engine And Engine Cooling Problems

HI, I HAVE A 2000 TOYOTA 4 RUNNER. IT HAS A LITTLE OVER 200K MILES AND I TOOK IT IN FOR SERVICE TO HAVE THE TIMING BELT AND WATER PUMP REPLACED. I DRIVE THE VEHICLE DAILY. THE MECHANIC DID NOT PERFORM THE WORK BECAUSE HE NOTICED THE FRAME HAD RUSTED THROUGH AND RECOMMENDED TO NOT DRIVE THE VEHICLE FOR SAFETY REASONS. HE STATED THAT IF THE FRAME DID BEND OR SEPARATE THE VEHICLE WOULD BUCKLE AND THERE WOULD NOT BE ANY CONTROL, ESPECIALLY ON THE EXPRESSWAY. THE MECHANIC RECOMMEND THAT I CHECK TO SEE IF THERE HAS BEEN ANY RECALLS. I DID CHECK TO SEE IF THERE WERE ANY RECALLS AND THERE WAS NOT. I WAS INFORMED THAT THE TOYOTA TUNDRA AND TOYOTA TACOMA HAD SIMILAR ISSUES WITH THE FRAME'S RUSTING THROUGH AND TOYOTA DID A RECALL/BUY BACK FOR THOSE VEHICLES. I WAS ON THE TOYOTA FORUM AND IT SOUNDS...

OUR 2000 TOYOTA 4RUNNER, ON A RECENT ROAD TRIP, HAD THE ENGINE LIGHT COME ON WHILE WE WERE IN RURAL KANSAS. UPON HAVING IT TOWED TO THE NEAREST TOYOTA DEALERSHIP, WE WERE TOLD IT HAD "ENGINE SLUDGE," AND THAT WE NEEDED, AT THE LEAST, A REBUILD OF OUR ENGINE, AND AT MOST A NEW ENGINE. THE CAR HAS BEEN WELL-MAINTAINED, AND PRIOR TO THIS INCIDENT HAD RUN FINE. OIL HAD BEEN CHANGED ON A REGULAR BASIS, AND THE VEHICLE HAD SUFFICIENT OIL, AND CLEAN-LOOKING OIL, AS IT HAD ALWAYS HAD. *TR